Telegraph-receptor



W. E. PEIRCE. TELEGRAPH RECEPTOR. APPLICATION FILED JAN. 17, 1917.

I11 ,32? 3% Patented Jan. 6, 1920.

I% 2y. i

justment applied to the amplifying contact ATENT orrrcn.

WILLIAM E. PEIRCE, OF NEWARK, NEW JERSEY.

TELEGRAPH-RECEPTOR.

Specification of Letters Patent.

Patented Jan. 6, 1920.

Application filed January 17, 1917. Serial No. 142,928.

To all whom it may concern:

. Be it known that I, WILLIAM E. Pnmon, of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Telegraph-Receptors, of which the following is a specification.

The present invention relates to improvements in apparatus or appliances 111 the above class, the purpose of the invention be ing the reception of weak or attenuated signals coming from a distance upon a telegraph line or wireless circuit and means for amplifying such signals so that they may be received clearly on a local Morse circult. This I accomplish by means of a specially constructed receptor in connection with other features which I illustrate in the accompanying drawing and will hereinafter be fully described. 2 I

Figure 1 represents a diagrammatic arrangement of my invention as applied to a telegraph circuit. Fig. 2 is a cross-sect on view of the receptor. Fig. 3 is a detail vlew of the receptor showing a screw tension adlever.

Reference is had to the drawings and the designated characters thereon.

Referring to Fig. 1, the numeral 1 1s a Morse key which is a part of a local circuit that includes battery 2 and magnet 3. This circuit actuates armature 4 which is pivoted at 5 and is held in normal position by the open coil spring 6. The tension of the coil. spring 6 is regulated by screw adjustment 7. The armature 4 is connected at its contact member 10 to the line connecting wire 8 through condenser 9. The incoming signals from the line 8 pass through'the armature contact member 10 through contact support 11 to receptor 12 to ground completing the receiving circuit.

The transmission of signals is effected by actuating the armature 4 through the medium of Morse key 1 which when depressed;

brings the armature contact member 10 against contact support 12 which is connected to the secondary 13 of an induction coil 14 and thence to ground. Simultaneously the armature 4 when depressed will make contact with the screw contacts 15 and 16. When this contact is made, a vibratory action is given to the interrupter armature 17 by means of a circuit made up of primary winding 18, interrupter contact screw 19 and battery 20 which returns to contact screw 16, thus completing the primary circuit. These vibrating impulses induce similar impulses in the secondary winding and pass to the line S'producing asuperimposed vibratory current on to the line without affecting regular Morse operation on said line should there be any such connected in on the same.

The method of superimposing a hi h frequency current as produced by an in uction coil on a regular Morse line is well known to the art and does not require detail description.

Referring again to the reception of signals from the line. The signaling current passes directly into the electromagnets of the receptor 12. The receptor 12' consists of a regular telephone receiver having polarized magnets which actuate magnetlcally a diaphragm 21 (see Figs. 2 and 3). Resting lightly upon diaphragm 21 is amplifying contact'lever 22 which is so pivoted as to permit the upper or electric contact end to have a greater air gap than its lower end. This is by reason of the difi'erence in the length of the lever arms.

The bearings at 23 at which lever 22 is pivoted, are preferably jeweled bearings. This has the efiect of greatly amplifying the vibratory signals coming in on the diaphragm 21 upon the upper or contact end of the amplifying contact lever 2.2. The amplifying contact lever 22- isheld in delicate poise normally toward the diaphragm 21 by spiral spring 32', the tension of which is adjusted by tension lever 33. The jeweled bearings 23 are supported by a bent flat spring 34 which is adjustable either up or down by adjustable screw 35. This latter adjust ment is quite important as it'makes it possible to adjust the distance of the contact lever 22 with the dia. hragm 21 to a nicety practically without isturbing the tension of the spiralspring 32 upon the contact lever 22. By means of the two adjustments separatel and independently made a fine range ofa just-ments to receivevibratory impulses from the diaphragm 21 is possible.

37 is a supporting post for the local contact points opposite that on the amplifying lever 22. 381s the contact screw and 39 is a lockwasher to hold the contact screw 38 securely in whatever position it is adjusted. A repeating circuit is made up with the contacts 24 and 25 (Fig. 1) which includes the battery 41, Morse relay 26 which energizes its armature 27, the lever of which is somewhat extended and makes connection at 30 with contact screw 81, when the amplifying lever 24 separates from its companlon contact 25. When the contact at 30 and 31 is made, a local circuit is energized, which includes battery 28 and Morse sounder 29.

The wire convolutions around the magnets in relay 26 are of such a number as to make the magnet respond to weak currents and the armature thereof is promptly responslve to them, making contacts at contact points 30 and 31. The extended lever of the armature 27 assists in the production of steady Morse signals, freeing them from waver or rattle. The long lever also permits of a very close adjustment of contacts.

The arrangement as embodied in Fig. '1 can be applied to a Morse duplex, quadruplex or single line Morse circuit and is connected to the line 8 through the condenser 9. This connection is made in the form of a tap connection ahead of either thel Morse duplex, quadruplex or single line Morse set of instruments, to which the line 8 may be connected for operation in the first instance.

N o apparent interference is manifested in the operation of the Morse duplex, quadrilplex or single line Morse instruments whlcli are only responsive to direct primary current that operate these sets at each end of the line and which receive current for circuit operation from an independent main battery or other source of electric power. The arrangement as shown in Fig. 1 sends out on the line a superimposed vibratory current of high frequency but of very low current value, and therefore are too weak to affect the relays in Morse duplex, quadruplex or single line Morse sets. This high frequency current flows very the condenser 9 being alternating in character.

The currents traversing the line to operate the Morse duplex or other sets 'as stated at each terminal end of the line is of such character that they will not'fiow very readily through the condenser 9, which only permits currents of high frequency toflow through it. v

The arrangement of a superimposition of a current of high frequency but of low current value over lines operating with duplex, quadruplex, or single line apparatus, is similar in principle to composite telephone and telegraph systems which are well known to the art.

The receptor as shown in Figs. 2 and 3 s also applicable as a wireless receptor, non the diathat on ear abling signals to be received phragm of the same similar to readily through a pivoted support for said phones of a regular wireless telephone receiver, the difference being that the signals will be relayed to a Morse sounder through the medium of the amplifying contact lever 22 and its electrical contacts upon local electric circuits which include said Morse sounder substantially as described.

In the details describing my invention a number of the features may be modified without departing from the spirit of the invention.

What I claim is:

1. In a telegraph receptor having a dia phragm, an amplifying lever in mechanical contact with the same, a support to which said amplifying lever is pivoted, means for adjusting said support, a spiral spring controlling tension of said amplifying lever and means for conveying signals received by said amplifying lever to a'Morse circuit substantially as described.

2. In a telegraph receptor consisting of a telephone receiver, an amplifying contact lever in mechanical phragm of said telephone receiver, aspiral spring controlling the tension of said amplifying lever means for adjusting the same, a pivoted support for said amplifying lever, means for adjusting said support, means for adjusting air gap of local contact points and a local Morse circuit controlled by operation of said amplifying contact lever substantially as described. 3. In a telegraph receptor having a diaphragm, an amplifying lever in mechanical contact with the same, a support to which said amplifying lever is pivoted, means, for adjusting said support, a spiral spring controlling tension of said amplifying lever and means for conveying signals received by said amplifying lever to a local Morse circuit substantially as described.

4. In a telegraph receptor consisting of a telephone receiver, an amplifying contact lever in mechanical contact with the diaphragm of said telephone receiver, a spiral spring controlling the tension of said amplifying lever means for adjusting the same, amplifying lever, means for adjusting said support, means for adjusting air gap of local contact points and a local Morse circuit controlled by operation of said amplifying contact lever substantially as described.

In testimony whereof I aflix my signature, in the presence of two witnesses.

WM. E. PEIRCE.

Witnesses:

A. C. BROWN, LUCY L. PIERCE.

contact with the dia. 

